SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a866789383f4593af3f75e1b9bb05ee8b22c9a1498f46b8501ef84237c36f777' 
  AND token = 'PpLQK+PvcS0i5OWOo7J7VekgVnNdhpq/CAicTsjEklM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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