SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33449a5e24f3141baf574a8fd7fee0b32246a152fd6aae5af53b42746e7ca118' 
  AND token = '1TPmjEzqPbBpYIB+saUAwjZX+f2YevYPh/PdnWBSDbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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