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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd6203e189c3f572c3bf3ec8340032acae899fa5106ef8de120e794358c788a' 
  AND token = 'tRqWd2aEafc6lIXhSG5KH4MAshvTBBagMdrhJmXAdPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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