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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15a3da41f10ff861983d74845ea579d77b216eaa56f835ad5202a71f423116e' 
  AND token = 'eSF9G6luFn3fvI+eQa46PTx6Q0XjCQ/5ZCtGDrZr3y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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