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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4636766b9da468080ac714795b1aad8f08a7d9557dca69ef01128dd1409773' 
  AND token = 'l8VXsv9caTp+xF8utxNyOc2zAcxh0FILCNbHAXyln+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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