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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca806efaacc10ca8c91e9b9007f7a0543755c75551be8ad33ca3647b9d2968a' 
  AND token = '2GAKx63RZAgV+vgg53rXcJFR/3jEei0QvC3RGzG5k7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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