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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bfda5271f147ba9bd45374c941dd65eda1c7b64c9a05b4304ab9f3dd1b8411' 
  AND token = 'imh/+qNzyfer8yla85SjplWpqW6HoBXJi72ADXLFujM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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