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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d5ac5d9096c8ba70dd5c08af6a15a6e0cecacaf22f2017cd0948e87378f193' 
  AND token = 'J9Pid78aIn6R8Fhrup95FPgX/rEF8VLFm2q+NNBhNkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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