SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f2288052e756fc08392cfc5d28dfda47b91650387dc6cf7bd6ceb4c3d1912' 
  AND token = 'an/BBMOjJwphHwB640GYR6RQGWzP3qISRQDcTz7bBXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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