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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cfa585d6a841acacd0cbd9bd9fa447b391dd32d5cbc523c3350913f8863d82' 
  AND token = '4ITtpWUL7sg5+a+dZ3teNvH/JG5XKgblscxbQ39uRmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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