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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7d0d0809f1addbc7de546d406aaf5d2bf01140728c3d8848b8723ab309875a' 
  AND token = 'JuoG6U7d3Ni9oAUjLx23s82/t7LOTFNrwrPVKYnY/bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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