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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1dc1fd8f370073d48a934accda4ef9b7d9fc2988a6adaa47b9e3966463db9e' 
  AND token = 'WtGGqB7f/VIbOtrd7suUO7Aky+EpkwoDZXZmIDPpGSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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