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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36adcb612ea5c2aa422ce1ecab71a107b0292e3863c8ef26534ec7bab22e9155' 
  AND token = 'kmFSasugD/kVGhtee6w31FdnIUMqPP6lWX0oghyBROY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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