SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f7e5d80658fca45712d1d4806bf0a4164ac86b163089124256e13c41ea728b' 
  AND token = 'QKAcpVBWKZjMthBgL9uj/pylxgHlALNwnTVyRHqjv/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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