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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7000c07fa7efe5e4819e59a8c278659df21df4536eabc291bdedf12020683bb6' 
  AND token = '9Y8gtUQ3H/hIji3W++X9pDMurYpsXSiKdufeEwZW968=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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