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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06ec190eb0242080ebf13209ec11763ba7a40d17ac5ac3c2ffa05bd0a54478f' 
  AND token = 'rt1hU31yx65aY+js14f9xSn0ChR2YkwuVgseUIN3U1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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