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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76260fdc867002900f070f1455a64b86c850646a92fb7cfa8e696ac626ce2724' 
  AND token = '3NTeMkxcGOXGDF28V02eZ13JIoqOgvidQQzyAem3OdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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