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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac312469517e31385677db0149b50656b798ff1282628c7173fb68d7197be7e' 
  AND token = '0Jua7RwiSOnbDpTa4Wx5l2JtKHc0AUq0J/sMXUK18iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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