SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c597e559a8485df0820fd099826e83bbf6cb5e7fd8e4dc0d7c7f83c6b59af2' 
  AND token = 'Z+9aVrS62XHgL/hMSMJ0m/lWvu58Q/fKBQwrM35vB+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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