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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f385d012b72e94afc86f0e621ce4e563e0f53d79a8af593e48dd1c79915bc3' 
  AND token = 'SkVrV0nma38Y2sfdwJsHjAY6a/6hX/hueZ6UE9LLGOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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