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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033f39d3ed9e0cb33a11fb26170eae5f751f2ea4ef8309fae9bfa975f1da9fe4' 
  AND token = 'YZmyJb78UZHUtiNmrnsooXupMZyNBkIELjJF5jJ9B/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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