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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d139018739da48f057ca458d7bc117b8104b98917de2006f6aaaed26698551a' 
  AND token = 'b83Tm1+0Kymcy2h/kzMWZCZH9TqKgo90G3Kfqu25M8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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