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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9722507a245d5a2c0f848c890731dae17d6251833bfc678c145d048521fc5bb' 
  AND token = 'ZBo8HFo0M8+ukHhIorvr9j+5MjNCgSWe8+GlepI2wWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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