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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7b91a0dc06738255e33190189fd82ed648cd89bc8625904d6e2ba3ec88035c' 
  AND token = 'SYbupLA97r6F0io7MjWVtTMrbY74OCkg5cfexhoJklk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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