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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3d4d0619822f0de1e7fb545e31b0fe90d2e17cbfba26a671805d715a98bd38' 
  AND token = 'ZANHCN8qrWj9cG28yQLOWzZ7r0wf35Gf9NuDssPibQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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