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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa1826acc00d017b306d1b4915334cb8af24aff34d6ff52fc771a1c7b5a4524' 
  AND token = 'K3iXrs9km0FenekD/eJXlvdEMkyNdulVxPgAVGWlwms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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