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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523b75931ec2d54da502cb529da24cde9bef153ea8062eaa2830fc5271fb63b0' 
  AND token = 'nduRsDC+5HXTqkEkWlyyDIiIoh6qZYcu+Hdvc6U5C1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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