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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dc0a098678c8a2874336f69034dfdabf8e3ee2e4fdb3bed6d11822f85fe65d' 
  AND token = 'SyQ5Z4MY0xcVOqcleYsV3lpM2fCVIV2Y/ILJzys6vHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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