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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd322f5f4b39f888efc741f525191376ed4b6afd137a6d4b8ffbd7d5162a637a3' 
  AND token = '4QEeqjtTa5leHFpSDl8I6PYrC7SgMoH51tW35hqAPD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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