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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ffcbe0c4cf5a6b26ed9ecccdd3220de19a83ae41e74f9a81dad5b326f122d0' 
  AND token = 'zxT7Dj5uljD1ND7KjNHR4sBCd/GPNr2MfJt9CXG3wWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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