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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f70b6d149b648819f211d66183e10f726e923da306a01c30de09e309ebdde4' 
  AND token = '9EeJSycE4l8CLi1E9EgqsTlwgTdF+GuN1K9gF6lCk3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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