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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60c59ec3d616c27e5d7be09a14f06041235275b2631adf90c83a10df9e0786f' 
  AND token = '9psgto41FVVVhA60Tv4KvX4ydoLxJigFJ5Ola+aJDt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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