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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aa326a64d10ebf0d96cea5b3e6a54bd73f9c4d3d80d7e62918c1027593e418' 
  AND token = 'TSalcWNfPY2zp5kyk/d/zX8Vj73H+JYyEjud0Bs7lv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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