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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9a9ac2a1dcafd55a4e666e3039c38312b59e2fe2928ea74b5a99a3be886484' 
  AND token = '5t17Ae7Mb1tAEu417ti1VAvwT/ChR8ygW20Odr8I6HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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