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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fcdc9f2aef739ce1b11aa4a305c76c7bc5676242a0aa60161dc14e1d423810' 
  AND token = 'DkjgywXVtAvPqIp4ZRsE9KgycfskK0b+u/lDUjnL2gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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