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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20238f4e070830c32cfb3e99c97f3269e49f4691bf593a936000f40b208d4edf' 
  AND token = 'X9kgV8py95YpKJBO9rHq98SxfdLkn8Phz0rMmhPmXJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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