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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cc5d9da34b68e515c3f2f644eefe5a0fcfd8b0835bbca3a8a0629e1564a8fc' 
  AND token = 'Rysi/W9S13zKkKiohg96k3s/xdWPFM8v45R+DnsezE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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