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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7f0b425e9e06ff71b344fc5262fd96dc6dd6736d79d3dbb4ff8e1a7f84ad88' 
  AND token = '9iXyUGO55bapTNrB2sRZa6ceDXrs0k0D+yXOWXsLYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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