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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e4df2cafdb35a1c608152490e79b1228120c24aa892b7c7cfaef0f5838a5b1' 
  AND token = '7OKjx6Qr6BCs7o0LeARtDAP8Of4YqZQtD25ssYzaJ5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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