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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fac9297f48be109d1b9dffcf31e4d754a4c23396dbd8a61fcda86e01971dea' 
  AND token = 'FK4Pucb+bcFUdfTZVZ2iuhp6+YEopvV1nY/KhdVst/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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