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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0323deb72cd5803a3d5f78006da35a0fc424ef59c88cbeaffa5f4a834de42f45' 
  AND token = '9kDzNJNB8DBulb7xERhwI4HHLnoKyI5ZtA9aS7IinaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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