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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a6bd96d6bd10615187fb4980c966c401acee3c6fc5d33082f146546feae9d4' 
  AND token = '0G2ZJRq/TxkuUOlU9+eV0J1ZSSucgrd4aeOOhmo3YzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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