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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be9c47a964e677349afd4d890ac076fd4cac6d0c9bbd17ed839cf27c70ed2fe' 
  AND token = 'vJn8SPVO+lk7BgN9+Mrkhsabx3YENAHsGLeQnIr4iik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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