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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be17220800f12142888aec5c4209715700d6dc477094ee5c57608f69e0d639ec' 
  AND token = 'eR8D4GM14PE79UwAljzSVoEPL1MzJDcUdE2S+hCniAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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