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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491845c434c450cf18e79c05deaf004cd4076760d786fba57a92b59992689853' 
  AND token = '3sElNs1wP0fhc8m+M3ICs40H7GZY0pXMnw4a9i31U3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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