SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a910e9e180bcc064a13a90c235dc835668f660ff302ab8d9eaef998a04772b4e' 
  AND token = '7Nb+bYK4GdACXF7RyVA+d+YBHNuhiTjlAJUV7lrvYKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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