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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118e59b281a2eeac95d2307d3920595b77de4f50118eba396240d6a6d5716c8c' 
  AND token = 'xspWIWZnnkTNzfrOldsKLHPC08P2c7THQvnnBQDbf4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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