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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcba5b8e9c261fb4d7c898d35a4b309389d953ae5015d2ad91cb8894fb85743' 
  AND token = 'DikXhYsRIm71+NR27YTiTR+D+t8miXYnAnppIuO+LiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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