SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795d0067eb6dde804f18eed1428df77e4677c3c212a35ed7db4256fc1334fc83' 
  AND token = 'sv0g/bgkh+MV+/2NhSVL3zfKR4DHjXEzrY1URSbPbBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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