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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0694cdaca8acf36143af184f86c6664f765c527573fa0006a36e66e5c6df5613' 
  AND token = 'XpvelQYauy1ie0qJ6dgZE2V4gP55NGKcyH1wUeyU/Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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