SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb403e022c2977cd5862ab43899b298415fb5ce8776f431e8274aff677446bb' 
  AND token = 'UjuE1fJPfHNCCzpcDSslRQwF7FsPbIwlWJctHunVqYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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