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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bd73df712f53e2b8dcfbeb2375ff8119d7bd761d216067a01ab19c075ed153' 
  AND token = 'tAOr1kZyvmNUdSTo/F1G0c915OanXcEEiaiJvxQ5ahU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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