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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b3d71cbc6f4a518260739b6883ea7171eba39f2942d4be389773765e5cae17' 
  AND token = 'yn5/rSjX5SCwJLsgglZxysOm6nIIlW5ybwy4Bw+36Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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