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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b68ca22c74ad672ce16b802063f9c2fa5d8a3ea67368da6b9403c9c342d037f' 
  AND token = 'NSOqnlJ//929olAwSIvyd9by2Mt0M2MBg1oHOEdNZew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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