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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f09d52a17c2dc29556cb16585462f2a3ae5d2c1f1793c743cd753df96b4cf1f' 
  AND token = 'xQX0ktUe/KCor978lKvvCI37xXkMQSxqt3N6UewjDtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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