SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b980bd8225aec38606fcd5a9bd446a99e6514d1934c3d9c036cdd89cee987c8' 
  AND token = 'kKZ7/2gwfjQRWU+ODU4mg6sPlQB4KmD+NqU5vtMiLtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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