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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f99c33512fe91cfbf04ea867bf92462f7079f650fcc6e4fa129bcb16be16fa' 
  AND token = 'Qqa2PKkcurCxtgCKrNjZ183oSyHIBbeRY7Tof2TaWII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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