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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3aff64f1029e2609cf28cc7df5b5f6ce6aaf2feb66cdd087d9b39bb2ed6656' 
  AND token = 'Y+TNGeeKbTa4hv8hi6HtbqNLpz6RwfW9JW1e49Zbt3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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