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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e9087a3efd70ea0b4d9d6d14f368ba0baa39bb59bec92a06db528d8a74d4ec' 
  AND token = 'fD+llN6vD8CIWdzN0UY4QEkNzhD36G8/E/Qrdq747KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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