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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5cbabe2a94ec90d705c967b08203ffcc9c1e03d13219cc6573a6151a95a4f3' 
  AND token = '6OYF5XZ9CY9telBrT8c8zerujLvxjLiFJ6CX7LOWHwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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