SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf154570a63ee87a63bdbdf955545bf21189cfabfadb2d0ce625ff145bebe97f' 
  AND token = 'EpkzHJFz8q8lHhzo85nq1VsiqwYYvBZDZvxHBkqmsX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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