SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb9caa723566f8dcfd70a0c7654f4b5495eea3e06a086ac46d1b7b69c0f5e0b' 
  AND token = '4mG+8chjqV8IztkXS6M/QChvFVyV2FqVf9cXYmD3MBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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