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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7ac2bf1edba959f44e008a605e6f9b87119f829aa892a096d30b143ed7b5cf' 
  AND token = 'aNEIYYk8dARmBUkToG4Glwa0uc5NaaJZIHR9NzaoAhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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