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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb016cc8838691adfe0237150405ce628c48425f14b5593be7e1a2c73bae0d5' 
  AND token = 's/F4rtQTUcjQBTY7g7IKOh3rT66a7UALe9orKeSeodM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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