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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaf88ed0636430619db32c2cdc760007d52a06541282746fb8c607dcfa67e45' 
  AND token = 'dnzNc7KzOdMN77EvfwTNU0kaxiKdcVYnaKspgm19Z/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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