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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23db54bc9b7a8e55587d67217a9f8eb873cf01ba0062c3c3ae760f85121a65a' 
  AND token = 'VWXcx+1J757QQbNPuiagwNqqnNnCDenJohUtuultKH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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