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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3c558f55840bf046ab4b5b15d8216f075bb752dae161ff2054aceba1f5e603' 
  AND token = 'UwENLZ6Gyjjky2WLRcF79+pFBwEJy8N635kX5PpyfOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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