SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b181c1b12662a66361f191d2cc236c564bdd9b810d9e752d2ac4e4b86ddb94dc' 
  AND token = 'CA1GHfxNBNGjz/fITqKZcAb7XtvwZ5pKYxtF9mZQozE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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