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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943e996403a414e2c1ca93c91c2bf1780f07c1eb64d119fc9ed9412df0bce334' 
  AND token = 'QzMsrV2FxffjHzU9hrK0BB7GakYz4KOCa9Io9iW2t4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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