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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5f6c53de91d6b5f7e41e779a04c54e2a3670f9da9c994bc6e67a3f7bb585ab' 
  AND token = 'sPEPuZrS0k8AEw6w7NYfZOflTpqouuQ05tr1rT9bkI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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