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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca38360fc22c102d89c83cb96a8c521d4f4ea79ad965dd7760472d9c2bf1611f' 
  AND token = '+DYHvM2aRYDveS1mMbqOr8k92+wFhvKEKoDRs+5hQZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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