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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604b46b7004f690c8e214b5ffeca8e7ab9998532b3a57426ad32a0a05ba16af4' 
  AND token = 'Wlf3O8jZ+Zp/eb2f0XNOUHIa7Gt/PtOCkZSfrZLJ9KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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