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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b009ab962f32351380ea2594d9c95314cc785285cd0cc14737df7b8d730d71' 
  AND token = 'Jen3YBtaPv+WoU9ZHr8viA9xCJrc++Uw+vd6EEE5jO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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