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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6d33a6e8efdb111581a4516962913412933a4347e2e07eed7bd81a4f45ae0b' 
  AND token = 'X3DKlBgzmJQoUecI7Ztl9sLLt0uMKc/sMeiblrTn8vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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