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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182ed9f5c18da1f1436bfe2165440551bd57991ed5cb08911931ed5642d2e799' 
  AND token = 'PM8puhb5lKI6noDC+xkvHFph/jHeJZ4PyIm9WZSMY/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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