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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7961b935f1497d839ece1a279eab7292e50a77a7ec6efac35561fa8da7bc38fb' 
  AND token = 'Qfh8Z1pHaZrTkIapoqY1mDlC40b77FsuhWMI1aRsPUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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