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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f9b385ce28dd61db2ea5913efa5a5f298d59db539bf9239a91d08ac918e8b5' 
  AND token = 'qgpdmdCVvAV+TusmIOSeSu5UXptpVVaWt8eVc3bAsnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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