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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7419631140b694ee264def5af9814735f410042bcc3eaca3f490ddb1e3b46a31' 
  AND token = '88Nce5vejGi5H59XFwYI6swCeyVzpvKPgf53UhZ1ZI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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