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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359e92c4bb06af064e2292a3780ed9db6ad410a28d4f59f8e88bed7946669e87' 
  AND token = 'G7RgQBMDV40lx2BAqWSb5iao88kIuLxZHWMqLj0jfVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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