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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fb8278c97416547e8eedc2f3ae8c1fb7418453969202b730882c87d1181d21' 
  AND token = '/xEbZ8YoZukEBymUsBLF1pltBgE8r5USNSDJhR3c7OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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