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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb5b30a8c3844d8e7b31015ae737aac5f21f09111f4eaa8459b428517f0c627' 
  AND token = 'T2xGtjxCJofO43oMsTvqwkag8HUF9hrBQd9ml+drrFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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