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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545c5cd4cadbe167e7374b5d97ffe31d35b49b08014efb77c3328ec1a7c4c31e' 
  AND token = 'J3c9Ozt5W3a8yOXTK5r8zUczq3oV803fgM5Ib2DlPBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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