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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f66af7d435528f61c9feaad9ead60baccbc63406a868b8df765193d15268630' 
  AND token = '6AQNjpVIL2Lh/mvdKM8dwc5waKlibuDaGTEVEGDptyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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