SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676b6c4d4f6feaba12a1b42bbc825a08d3e55a2916d4541f6627f071473e8de3' 
  AND token = 'h+CPEaMZlKuC0hA0jbpM7iJOlP4MpoeCwJvzgi/oNYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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