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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e763a3486cdeb521327da69cc7b3aa3ac0f7cfc2e15b2f49741e80a59346ec5' 
  AND token = '38RfPM1pEefKD7T8iePBuDN3cZ3OpHckuMLu5D+0KfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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