SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bd6d2f50d0f8433c1a308cfb02e524758bc48de39b1c871d0dafcb1756a6cd' 
  AND token = 'WO25Kr+MJm4sqOGPGiXZTC6XmrTH/z/sXpaz+NIVswo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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