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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c14baf5f761aaa332d7ef558d651e83609dc5f85391ed73911bf3c6dfc0f9d' 
  AND token = 'ezII8iYw3P7DLH6fraZXbt+XuQd2bXO4Inztgr5DV8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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