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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8996cf9bdd0a82ace48796be5ae988f47407ee136bb3d262930ced3cfb73e12e' 
  AND token = '9coBw46WWgvWlF8sjBAH9OJB2d9P6u+zMvXin0hcv5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}