SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb8d187e2cc3cdfc4f39082a912418733032820776bd58e843f6ca863e2d314' 
  AND token = 'TmBqMaWdVJ6oH9rVNL0zjPSiWv4FZvgsXljELAasNrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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