SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659ff180f4d68d039b29dbdc4f5ea6720b0832d271f16d281b89264918303fe3' 
  AND token = 'F/qpclQuy/CE/euKVB2K8+4vZiazgrgXEuewkRAWu/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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