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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335b7404a35b831dc5a1281bb77b96c8adc85aeca8e045c088b9429695d3a15b' 
  AND token = '3qeR8rZ0xMWp1yvHRZNwytQIDP3jzfj77ITKu7NrBO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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