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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964a3488930cdc7bb14446eddfe0aec0321d6bd701d7dd956082f4d3d9fb7a89' 
  AND token = '1NHXMu5dNHNOZWBsyHf/UFOAlWSsbiQXq45ECyuZAtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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