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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564448869f242493ba3405eaca5772eaf1606aad643587db936fa96a9c7e31ba' 
  AND token = 'Op1WkIscMPCLWVDeIPwP/0/D82hIgTA1Aary1xijRcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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