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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fce1ee006e09ddf1b93acd11da26fa0f17343967b879aa960f12a97d6360161' 
  AND token = '0MT6/7o/H1QLK+pVZVIVVkXpOJqjR2ym8xMEEkhpZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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