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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24c1b85693bc76d8610ac832fdfe0a0d7fb304cc25abe1db062b65e181bec43' 
  AND token = 'N+kMklz9RF5aQHJhCeT6xFU3Mz/8fk83lVddhws2yQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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