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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a1ee419abb6de1b17e066d1d8357fb8a9c5710a5d816796a44e82eddfb43f5' 
  AND token = 'XV5w+1huYdo12Rugt4euShwd0AXeMc5trmIKRyoEj9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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