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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c8507f0537af533f22806cf98acb56587c4b5fc0fcafbaa9b473f1e1df9900' 
  AND token = 'ptY8kGmuS1bgvwBaB0HHRXPBqT/FFHhquNnWg0N7USI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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