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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801a586492e0f8799af28911cce5978e665c9a4cfa27fdd11ebcf7b834064186' 
  AND token = 'zA0MvvMXS72UhGWTO2+KtfTQK6I2VO+dkMKTtG/EBo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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