SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62eb0567cac9f496b687ca57d324556264d5a7d1f1012cc344c84e1d8d447bb1' 
  AND token = 'ljBwjkujxL9r7G1PPhzHi2zXCCifCc6VOQqXNhJTA8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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