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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b930403d9c2c0baeacc0d20a62a971dd6fc322bb8c1e87af8a4bf239ddbd40d' 
  AND token = 'KV7du2686ILX9AteR/3e3Pjxa7Ulp6w22sI7qWlxIOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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