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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9d72a3abb1d76557073c2eb6d5cda0fa2b6a557692b7a2313c69e1ddcb5b9d' 
  AND token = 'nCo0dEu2QVSmEN9Zpcs4WYaKRHBW/M5RdD8xO97iJxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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